error CS0102: The type 'MainWindow' already contains a definition for 'Filename' about boilerplatezero

[IGood]

Thanks for providing all this great info!

I can confirm that I get errors in these versions

Microsoft Visual Studio Community 2022 (64-bit) - Current
Version 17.2.6

Microsoft Visual Studio Community 2022 (64-bit) - Preview
Version 17.3.0 Preview 1.1

I'll continue investigating. This bug makes me very sad.

[IGood]

Good news!

This is a known bug with a workaround that I found here - dotnet/wpf#6792 (comment)

	<Target Name="RemoveDuplicateAnalyzers" BeforeTargets="CoreCompile">
		<!-- Work around https://github.com/dotnet/wpf/issues/6792 -->
		<ItemGroup>
			<FilteredAnalyzer Include="@(Analyzer->Distinct())" />
			<Analyzer Remove="@(Analyzer)" />
			<Analyzer Include="@(FilteredAnalyzer)" />
		</ItemGroup>
	</Target>

[graealex]

Addendum:

private static readonly DependencyProperty FilenameProperty = Gen.Filename<string>();

causes similar "already contains a definition" errors. It's as if the generated code gets compiled twice.

[IGood]

Yikes! I haven't seen this problem before.
From what you've said - it does seem as if the code generation is happening 2x 🤔

Is there more information in the compiler output log? Perhaps details about file/line where each occurrence exists?

[graealex]

I have created a minimal test case that reproduces the issue:

• Create a new WPF project (.NET 5)
• Add boilerplatezero via Nuget
• Add private static readonly DependencyProperty BlaBlaProperty = Gen.BlaBla<string>(); to MainWindow.xaml.cs
• Compile fails with mentioned errors
• Commit all to Github
• Deleted the local repo
• Cloned the repo from Github
• Opened local repo with VS.2022, click "Build" - get the same errors

The repo is here: https://github.com/graealex/BpzWpfTestNuget

1>C:\Work\BpzWpfTestNuget\boilerplatezero\Bpz.Wpf.DependencyPropertyGenerator\bpz.DependencyProperties.g.cs(16,18,16,24): error CS0102: The type 'MainWindow' already contains a definition for 'BlaBla'
1>C:\Work\BpzWpfTestNuget\boilerplatezero\Bpz.Wpf.DependencyPropertyGenerator\bpz.DependencyProperties.g.cs(26,37,26,43): error CS0111: Type 'MainWindow.Gen' already defines a member called 'BlaBla' with the same parameter types

[graealex]

Addendum: the same project compiles fine without any errors in:

Microsoft Visual Studio Community 2022 (64-bit) - Preview
Version 17.3.0 Preview 2.0

The problematic version seems to be:

Microsoft Visual Studio Community 2022 (64-bit) - Current
Version 17.2.5

Updating to the newest preview version reintroduced the error:

Microsoft Visual Studio Community 2022 (64-bit) - Preview
Version 17.4.0 Preview 1.0

Really not sure what the culprit is.

[graealex]

build.detailed.log
build.diag.log

Also logs to the build process when launched from command line dotnet build --verbosity diag and dotnet build --verbosity detailed

[IGood]

Thank you, @graealex, for donating to support this project! You are very kind.